Disk filter comprising a tank for the liquid to be filtered, a tubular shaft carrying, spaced in its longitudinal direction, filtering disks which consist of functionally independent, hollow filtering sectors communicating through holes made in the mantle of the tubular shaft and located at the tips of the sectors with the interior space of the tubular shaft, the different filtrates coming from the filtering sectors being removed from the different chambers with the aid of vacuum introduced into said interior space. The chambers are established when within the tubular shaft there is placed a slide member which is stationary as the shaft rotates and which divides the interior of the shaft in the transversal direction into sectors and which is confined by ends at either of the shaft.